Iron is good for creating solenoids because its _(blank)_ and _(blank)_ allow it to be magnetized and demagnetized quickly.

high susceptibility; high retentivity

high susceptibility; low retentivity

low susceptibility; high retentivity

a

low susceptibility; low retentivity

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.

the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.